<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .demo {
        width: 100px;
        height: 100px;
        background-color: bisque;
        overflow: hidden;
      }
      .box {
        height: 20px;
        background-color: cadetblue;
        margin: 10px;
      }
    </style>
  </head>
  <body>
    <div class="demo">
      <div class="box"></div>
    </div>
    <script src="./38-WeakRefs&FinalizationRegistry.js"></script>
  </body>
  <script>
    // let obj = {
    //   age: 10,
    // };
    // console.log(obj.__proto__);
  </script>
</html>
